"Objectification is an attitude that regards a person as a commodity or as an object for use, with little or no regard for a person's personality or sentience."
If you're a model, that's what you do for a living. I mean, they use their body to demonstrate clothing. Where could they get the space to display their personality and sentience here?

If it's okay for them it should also be okay for everyone else, don't see why not.